Dual La2a - [silent:arts] version
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Yes, the heater goes to ground via the 100r (but you used the holes right after the terminal block, before the 100r resistors ?)
or wait, maybe you did not know you have to wire the heaters like in Drips v1 ?
should look something like this, or better (the silicon cable I used is not good drilled together:
Take the tubes out and measure each heater terminal block input to ground if you actually have 100r. the PCB Billex made for me had a short at one side to ground (I checked the PCB Bernd send me for this, and it was right - but you never know).
[edit: with no power transformer connected of course]
the neon lamp is on the HV rail, if it shines it has more than 65V - that's good.
the best place to measure the HV (High Voltage) is the left side (looking from the front) of R129 or R229.
or wait, maybe you did not know you have to wire the heaters like in Drips v1 ?
should look something like this, or better (the silicon cable I used is not good drilled together:
Take the tubes out and measure each heater terminal block input to ground if you actually have 100r. the PCB Billex made for me had a short at one side to ground (I checked the PCB Bernd send me for this, and it was right - but you never know).
[edit: with no power transformer connected of course]
the neon lamp is on the HV rail, if it shines it has more than 65V - that's good.
the best place to measure the HV (High Voltage) is the left side (looking from the front) of R129 or R229.
Zuletzt geändert von [silent:arts] am Fr Feb 11, 2011 8:23 am, insgesamt 3-mal geändert.
volker
olafmatt hat geschrieben:Strom kann tot machen
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- Beiträge: 3520
- Registriert: Sa Jun 10, 2006 5:54 pm
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- Beiträge: 265
- Registriert: Sa Jun 03, 2006 6:26 pm
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- Beiträge: 265
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ok...this thing is running and compressing.
gain ratio have to be tuned like volker said (i use sowters) i do it later....
one problem is, that my unit hums a bit. more then it is ok for me
it comes not from the powertransformer, i can move it from side to side and nothing happens.
maybe the ac heaters under the pcb?
i have measured the heater against ground, and i only have around 60 ohms
resistance between ground, but volker said it have to 100R?
maybe this is the fault?
maybe someone has an idea where to look first....
i will try and try
gain ratio have to be tuned like volker said (i use sowters) i do it later....
one problem is, that my unit hums a bit. more then it is ok for me
it comes not from the powertransformer, i can move it from side to side and nothing happens.
maybe the ac heaters under the pcb?
i have measured the heater against ground, and i only have around 60 ohms
resistance between ground, but volker said it have to 100R?
maybe this is the fault?
maybe someone has an idea where to look first....
i will try and try
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- Beiträge: 265
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- Beiträge: 3520
- Registriert: Sa Jun 10, 2006 5:54 pm
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- Beiträge: 3520
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how much is "a bit" ? (LA2As are not famous for low noise)waldorfcave hat geschrieben:gain ratio have to be tuned like volker said (i use sowters) i do it later....
one problem is, that my unit hums a bit. more then it is ok for me
is the hum constant or gain depended ?
volker
olafmatt hat geschrieben:Strom kann tot machen
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Did you mount the 7805 isolated from heatsink and caseground? Doppelkühlung You may have a ground loop. Is hum frequency pre (mains side) or post rectifier (double mains frequency)?
-Harpo
-Harpo
mische lauter - Ohren wachsen nach
Ist mir Scheißegal wer dein Vater ist. Solange ich am Angeln bin, gehst Du hier nicht übers Wasser !
Ist mir Scheißegal wer dein Vater ist. Solange ich am Angeln bin, gehst Du hier nicht übers Wasser !